TEST ON VAGINA DISCHARGE
TEST ON VAGINA DISCHARGE
The normal vaginal discharge is white, nonhomogeneous, and
viscous. It contains vaginal squamous epithelial cells in a serous transudate,
as well as material from sebaceous, sweat, and Bartholin's glands, and
secretions from the cervix. A small number of polymorphonuclear leukocytes may
be seen, probably coming from the cervix. The pH is below 4.5, usually between
3.8 and 4.2. The predominant organisms are lactobacilli, large gram-positive
rods.
The quantity of normal discharge varies from woman to woman and
increases during ovulation, premenstrually, and during pregnancy. A normal
discharge does not have an offensive odor and is not associated with vaginal
irritation, itching, or burning.
Technique
A variety of tests and cultures can be done on secretions obtained
at the time of pelvic examination. None is more important than the microscopic
examination. Using a Q-tip, obtain some secretions from the posterior fournix.
To prepare a wet prep, use one of the two following methods.
- Place the sample in 1 ml of
saline and agitate to mix. Take a drop of this mixture and place it on a
slide.
- Place a drop of saline on a
slide and add a small amount of the discharge.
In either case, cover with a cover slip. The first method is
preferred if the discharge is profuse, as it will dilute the secretions so that
individual cells can be seen better.
The slide may be warmed briefly (to increase motility of
trichomonas) and should be looked at promptly. A careful search of several
fields should be made at both medium and high power for trichomonas, clue
cells, and yeast. Trichomonas are motile flagellated organisms about the size
of a white blood cell (WBC). They are best recognized by their characteristic
twisting motion. Clue cells are vaginal epithelial cells with adherent
coccobacilli. Yeast may be seen as budding or hyphal forms, and may be seen
best with the addition of potassium hydroxide.
Lastly, the presence or absence of a large number of leukocytes
should be noted. A few may be normal, but more than 10 per high-power field is
abnormal.
An additional swab should be taken and some discharge placed on a
slide. Add a drop of 10% potassium hydroxide (KOH) and cover
with a cover slip. Heat the slide just until bubbles form under the cover slip,
but no longer. This aids in lysis of the cells, but leaves fungi. The slide
should then be examined carefully for the presence of budding yeast or hyphae.
The pH of the vaginal secretions can be obtained
by placing a sample from the lateral wall of the vagina on pH paper. The paper
should include a range of pH from 4.0 to above 5.0. The normal pH is 4.5 or
less.
The whiff test is a test for the fishy odor that
occurs in bacterial vaginosis (previously called Gardnerella vaginitis and
nonspecific vaginitis). A drop of KOH is mixed with some vaginal discharge. A
positive test is abnormal and consists of a characteristic fishy odor.
Gram stain of
the vaginal discharge can be done using standard methods. Yeast will be
detectable, and the predominant bacterial flora may be assessed (e.g., normal
gram-positive bacilli or abnormal gram-negative coccobacilli and rods). Clue
cells can be identified accurately.
Gram stain of the endocervical mucous may be helpful in the
evaluation of cervicitis. If gram-negative diplococci are seen inside cells,
this is diagnostic for Neisseria gonorrhea. This is a relatively insensitive
test, however, and should not substitute for a culture. An excess of leukocytes
(more than 10/hpf) in the endocervical mucous suggests chlamydial cervicitis,
and appropriate studies should be obtained.
In addition to information about cervical cytology, the Papanicolaou
(Pap) smear will often add information regarding possible vaginal and
cervical pathogens. For example, trichomonas or yeast may be seen. Certain
cytologic changes may suggest chlamydial cervicitis. Endocervical and
ectocervical Pap smears should be obtained as described in Chapter 179.
Cultures should never
substitute for a careful history, physical examination, and microscopic
examination of the wet prep. Depending on the results of a vaginal culture
without microscopic examination of the secretions will result in frequent
errors in treatment. Nevertheless, cervical cultures may be especially helpful
in some cases.
Yeast will grow on routine culture as well as on specific media.
Trichomonas may be cultured, but this is not available in most laboratories.
Cervical cultures for N. gonorrhea are done by placing a
sterile swab into the endocervical canal. Ideally, this should be plated on a
specific medium immediately, as delay decreases the yield sharply. Chlamydia
cultures are expensive and require a week for results. Recently
immunofluorescence techniques have become available. These are less expensive
and results are available sooner.
Basic Science
Pathologic vaginal discharges are caused by a variety of
infectious and noninfectious causes. The discharge may be caused by infections
of the vagina itself, but infections or inflammation of the cervix also lead to
an increase in vaginal discharge. In many patients, more than one cause is
present.
A careful history and physical may help to separate these two
conditions and point to an etiology. On pelvic examination, careful attention
should be paid to the presence or absence of cervical inflammation, usually
manifest as edema or friability, and to the presence or absence of cervical
mucopus, that is, mucoprurulent secretions in the endocervical canal. Cervical
inflammation or mucopus suggest cervicitis, but cervical infections such
as N. gonorrhea and C. trachomatis can be
present without them and should be sought in appropriate patients.
The three major causes of vaginitis are Trichomonas,
Candida, and bacterial vaginosis. These can be distinguished by appropriate
laboratory tests.
Trichomonas Vaginalis
Trichomonas vaginalis is a protozoan parasite. It grows best in moderately
anaerobic conditions when the pH is 5.6 to 6.5. It can be seen in asymptomatic
women, but when symptomatic, it causes a white to yellow discharge that may be
frothy. The classic findings of vaginal petechiae are relatively uncommon. An
odor may be present. The pH is usually high (greater than 5.0), and the
discharge often contains numerous WBCs. In florid cases the wet prep reveals
numerous motile organisms, but in milder cases a careful search through many
fields must be made to see one or two motile organisms. Wet prep is not 100%
sensitive. Culture-positive patients have been found to be wet-prep positive in
as few as 50 to 60% of cases. Although cultures are more accurate, they are not
available in most laboratories. Therefore, trichomonas cannot be ruled out in
patients with a negative wet prep. Pap smears may also reveal trichomonas. A
discharge with a large number of white blood cells in a patient who does not
have cervicitis suggests trichomonas.
Candida
Candida vaginitis may elicit no vaginal discharge, merely causing
vulvar and/or vaginal erythema. If a discharge is present, it is usually thick,
white, so-called cottage cheese. The pH is normal. There is no abnormal odor,
and the whiff test is negative.
Wet prep reveals normal epithelial cells. There may be a small
increase in the number of WBCs. The bacteria are the normal lactobacilli. Wet
prep may reveal yeast, as budding forms or pseudohyphae. Potassium hydroxide is
somewhat more sensitive, but its sensitivity varies, being as low as 20% in
some series of culture-positive patients. Therefore, treatment must often be
based on clinical suspicion alone.
Candida may be grown on a
variety of media. Cultures are more accurate than microscopic examination
alone, but the significance of a positive culture in an asymptomatic patient is
unknown, so cultures should be done only to confirm suspected cases.
Nonspecific or Bacterial Vaginosis
This form of vaginitis is possibly the most common. A diagnosis is
made if three of the following four criteria are present: adherent and
homogeneous discharge; positive whiff test; clue cells; or pH greater than 4.5.
The positive whiff test is caused by aromitization of aromatic amines in the
presence of KOH. Gram stain will reveal gram-negative coccobacilli adherent to
epithelial cells. If WBCs are present in large numbers, coexisting trichomonas
or cervicitis should be suspected, as bacterial vaginosis does not elicit an
inflammatory response.
One can culture for Gardnerella vaginalis (i.e,
the organism felt to be at least partly responsible for this disease), but a
positive culture is not diagnostic as Gardnerella may be present in small
numbers in normal women, so the diagnosis rests on the above combination of
findings.
Cervicitis
Cervicitis may cause a purulent discharge from the cervix. The
discharge will not have an odor and will consist of sheets of white blood
cells; the vaginal pH is variable. Gram stain may reveal gram-negative
intracellular diplococci if N. gonorrhea is the cause.
Appropriate tests for gonorrhea and tests for chlamydia must be done, but
treatment should not be delayed because ascending infection may occur.
Clinical Significance
Vaginitis and cervicitis are extremely common conditions and are
responsible for many office visits and much discomfort to patients. Cervicitis
may lead to serious ascending infections and subsequent tubal infertility.
Because of this, accurate and prompt diagnosis is mandatory. There is no excuse
for trying to diagnose the cause of a vaginal discharge without the use of
laboratory tests. The most important is the wet prep, which allows the
clinician to distinguish between the three common causes of vaginitis.
Cervicitis may be suspected because of findings on physical examination or if
there are numerous WBCs on microscopic examination, especially if these cannot
be explained by a trichomonas infection.
In certain cases, screening cultures for gonorrhea and tests for
chlamydia should be done. These cases might include women who have other
sexually transmitted diseases, such as trichomonas; women with multiple sexual
partners; and perhaps other groups. Cultures are mandatory in women with
mucoprurulent cervicitis.
Treatment for the cause of a vaginal discharge should be based on
what the clinician feels is the likely pathogen after completion of the
history, physical examination, and examination of the discharge. Correct
therapy and a successful outcome depend on the accuracy of the diagnosis.
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